Chapter 9, Problem 20QA

Suppose three countries’ per capita Gross Domestic Products (GDPs) are £1000, £2000, and £3000. What is the average of each pair of countries’ GDPs per capita? (b) What is the difference between each of the individual observations and the overall average? What is the sum of these differences? (c) Suppose instead of three countries, we had a sample of 100 countries with the same sample average GDP per capita as the overall average for the three observations above, with the standard deviation of these 100 observations being £1000. Form the 95% confidence interval for the population mean. (d) What might explain differences in GDP across countries?       Consider the following regression equation, where Earnings is measured in £/hour, and Experience is measured in years in a particular job, with standard errors in parentheses: Earnings \ = −0.25 (−0.5) + 0.2 (0.1) Experience,   One of these numbers has been reported incorrectly - it shouldn’t be negative. Which one and why? (b)…

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You want to buy equipment that is available from 2 companies. The price of the equipment is the same for both companies. Silver Research would let you make quarterly payments of $9,130 for 3 years at an interest rate of 3.27 percent per quarter. Your first payment to Silver Research would be today. Island Research would let you make monthly payments of $3,068 for 3 years at an interest rate of X percent per month. Your first payment to Island Research would be in 1 month. What is X? Input instructions: Input your answer as the number that appears before the percentage sign. For example, enter 9.86 for 9.86% (do not enter .0986 or 9.86%). Round your answer to at least 2 decimal places. percent